Source: Noto Sans Symbols

U+24EF NEGATIVE CIRCLED NUMBER FIFTEEN

U+24EF was added to Unicode in version 3.2 (2002). It belongs to the block U+2460 to U+24FF Enclosed Alphanumerics in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Other Number and is commonly used, that is, in no specific script. The codepoint has the Numeric value 15.

The glyph is not a composition. It has a Ambiguous East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. In text U+24EF behaves as Ambiguous (Alphabetic or Ideographic) regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

Enclosed Alphanumerics is a Unicode block of typographical symbols of an alphanumeric within a circle, a bracket or other not-closed enclosure, or ending in a full stop.
It is currently fully allocated. Within the Basic Multilingual Plane, a few additional enclosed numerals are in the Dingbats and the Enclosed CJK Letters and Months blocks. There is also a block with more of these characters in the Supplementary Multilingual Plane named Enclosed Alphanumeric Supplement (U+1F100–U+1F1FF), as of Unicode 6.0.

Representations

System	Representation
Nº	9455
UTF-8	E2 93 AF
UTF-16	24 EF
UTF-32	00 00 24 EF
URL-Quoted	%E2%93%AF
HTML-Escape	⓯
Wrong windows-1252 Mojibake	â¯

Elsewhere

Complete Record

Property	Value
Age	3.2 (2002)
Unicode Name	NEGATIVE CIRCLED NUMBER FIFTEEN
Unicode 1 Name	—
Block	Enclosed Alphanumerics
General Category	Other Number
Script	Common
Bidirectional Category	Other Neutral
Combining Class	Not Reordered
Decomposition Type	None
Decomposition Mapping	Negative Circled Number Fifteen
Lowercase	✘
Simple Lowercase Mapping	Negative Circled Number Fifteen
Lowercase Mapping	Negative Circled Number Fifteen
Uppercase	✘
Simple Uppercase Mapping	Negative Circled Number Fifteen
Uppercase Mapping	Negative Circled Number Fifteen
Simple Titlecase Mapping	Negative Circled Number Fifteen
Titlecase Mapping	Negative Circled Number Fifteen
Case Folding	Negative Circled Number Fifteen
ASCII Hex Digit	✘
Alphabetic	✘
Bidi Control	✘
Bidi Mirrored	✘
Composition Exclusion	✘
Case Ignorable	✘
Changes When Casefolded	✘
Changes When Casemapped	✘
Changes When NFKC Casefolded	✘
Changes When Lowercased	✘
Changes When Titlecased	✘
Changes When Uppercased	✘
Cased	✘
Full Composition Exclusion	✘
Default Ignorable Code Point	✘
Dash	✘
Deprecated	✘
Diacritic	✘
Emoji Modifier Base	✘
Emoji Component	✘
Emoji Modifier	✘
Emoji Presentation	✘
Emoji	✘
Extender	✘
Extended Pictographic	✘
FC NFKC Closure	Negative Circled Number Fifteen
Grapheme Cluster Break	Any
Grapheme Base	✔
Grapheme Extend	✘
Grapheme Link	✘
Hex Digit	✘
Hyphen	✘
ID Continue	✘
ID Start	✘
IDS Binary Operator	✘
IDS Trinary Operator and	✘
Ideographic	✘
Indic Mantra Category	—
Indic Positional Category	NA
Indic Syllabic Category	Other
Jamo Short Name	—
Join Control	✘
Logical Order Exception	✘
Math	✘
Noncharacter Code Point	✘
NFC Quick Check	Yes
NFD Quick Check	Yes
NFKC Casefold	Negative Circled Number Fifteen
NFKC Quick Check	Yes
NFKD Quick Check	Yes
Other Alphabetic	✘
Other Default Ignorable Code Point	✘
Other Grapheme Extend	✘
Other ID Continue	✘
Other ID Start	✘
Other Lowercase	✘
Other Math	✘
Other Uppercase	✘
Prepended Concatenation Mark	✘
Pattern Syntax	✘
Pattern White Space	✘
Quotation Mark	✘
Regional Indicator	✘
Radical	✘
Sentence Break	Other
Soft Dotted	✘
Sentence Terminal	✘
Terminal Punctuation	✘
Unified Ideograph	✘
Variation Selector	✘
Word Break	Other
White Space	✘
XID Continue	✘
XID Start	✘
Expands On NFC	✘
Expands On NFD	✘
Expands On NFKC	✘
Expands On NFKD	✘
Bidi Paired Bracket	Negative Circled Number Fifteen
Bidi Paired Bracket Type	None
East Asian Width	Ambiguous
Hangul Syllable Type	Not Applicable
ISO 10646 Comment	—
Joining Group	No_Joining_Group
Joining Type	Non Joining
Line Break	Ambiguous (Alphabetic or Ideographic)
Numeric Type	Numeric
Numeric Value	15
Simple Case Folding	Negative Circled Number Fifteen
Script Extension
Vertical Orientation	U